<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!--卡片视图-->
        <el-card>
            <!-- 提示区域 -->
            <el-alert :closable="false" center show-icon title="添加商品信息" type="info">
            </el-alert>

            <!--步骤条区域-->
            <el-steps :active="activeIndex - 0" :space="200" align-center finish-status="success">
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- 注意一下嵌套规则, 表格form嵌套tabs-->
            <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-position="top" label-width="100px">
                <!-- tab栏区域
          before-leave: 切换标签之前的钩子函数, 若发挥FALSE或返回Promise且被reject, 则阻止切换
                        类型  Function(activeName, oldActiveName)
        -->
                <el-tabs v-model="activeIndex" :before-leave="beforeTabLeave" :tab-position="tabPosition"
                    @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <!-- 在Form组件中, 每个表单域由一个Form-Item组件构成, 表单域中可以放置各种类型的表单控件,
                包括Input, Select, CheckBox, Radio, Switch, DatePicker, TimePicker
            -->
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <!--  选择商品分类区域 -->
                            <el-row>
                                <el-col>
                                    <!-- 选择商品分类的级联选择框 -->
                                    <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps"
                                        clearable @change="handleChange"></el-cascader>
                                </el-col>
                            </el-row>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!--渲染表单的Item项-->
                        <el-form-item v-for="(item) in manyTableData" :key="item.attr_id" :label="item.attr_name">
                            <!--复选框组-->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox v-for="(cb, i)  in item.attr_vals" :key="i" :label="cb" border
                                    size="small">
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item v-for="(item) in onlyTableData" :key="item.attr_id" :label="item.attr_name">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片要上传到后台的API地址
                :on-success-->
                        <el-upload :action="uploadUrl" :headers="headerObj" :on-preview="handlePreview"
                            :on-remove="handleRemove" :on-success="handleSuccess" class="upload-demo"
                            list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件-->
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!--添加商品的按钮-->
                        <el-button class="btnAdd" type="primary" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog :visible.sync="previewVisible" title="图片预览" width="50%">
            <img :src="previewPath" alt="#" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    name: 'Add',
    data() {
        return {
            activeIndex: '0',
            // 选项卡所在的位置
            tabPosition: 'left',
            // 添加商品的表单对象
            addForm: {
                goods_name: '',
                // 商品所属的分类数组
                goods_cat: [],
                goods_price: 0,
                goods_number: 0,
                goods_weight: 0,
                // 商品的详情描述
                goods_introduce: '',
                // 上传的图片临时路径
                pics: [],
                attrs: []
            },
            // 添加商品的表单校验对象
            addFormRules: {
                goods_name: [
                    {
                        required: true,
                        message: '请输入商品名称',
                        trigger: 'blur'
                    }
                ],
                goods_price: [
                    {
                        required: true,
                        message: '请输入商品价格',
                        trigger: 'blur'
                    }
                ],
                goods_weight: [
                    {
                        required: true,
                        message: '请输入商品重量',
                        trigger: 'blur'
                    }
                ],
                goods_number: [
                    {
                        required: true,
                        message: '请输入商品数量',
                        trigger: 'blur'
                    }
                ],
                goods_cat: [
                    {
                        required: true,
                        message: '请输入商品分类',
                        trigger: 'blur'
                    }
                ]
            },
            // 商品列表数据
            cateList: [],
            // 为 options数据源, 配置键名 [选项标签名label / 选项标签对的值value]
            cateProps: {
                // 指定选项标签的值: 选项对象的某个属性值
                label: 'cat_name',
                // 指定选项的值: 选项对象的某个属性值
                value: 'cat_id',
                // 指定选项的子选项
                children: 'children',
                // 从el-cascader标签的属性,中移动到这个cascadeProps中
                expandTrigger: 'hover'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 动态参数列表数据
            onlyTableData: [],
            // 上传图片的url
            uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization:
                    window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    },
    methods: {
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品列表失败!')
            }

            this.cateList = res.data
            console.log(this.cateList)
        },
        /**
         *
         */
        handleChange() {
            console.log(this.addForm.goods_cat)
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
                return
            }
            // todo
        },
        /**
         * 阻止标签页的切换
         */
        beforeTabLeave(activeName, oldActiveName) {
            // console.log('即将离开的标签也名字是' + oldActiveName)
            // console.log('即将进入的标签也名字是' + activeName)
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类!')
                return false
            }
            return true
        },
        /**
         *
         */
        async tabClicked() {
            // console.log(this.activeIndex)
            // 证明访问的是动态参数面板
            if (this.activeIndex === '1') {
                console.log('动态参数列表')
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: 'many' }
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败!')
                }
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })

                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
                console.log('静态属性列表')
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: 'only' }
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取静态属性列表失败!')
                }
                this.onlyTableData = res.data
                console.log(this.onlyTableData)
                // todo
            }
        },
        /**
         * 处理移除图片的操作
         */
        handleRemove(file, fileList) {
            console.log(file, fileList)

            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中, 找到这个图片对应的索引值
            const index = this.addForm.pics.findIndex(item => {
                return item.pic === filePath
            })
            // 3.调用数组的splice方法, 把图片信息对象, 从pics数组中移除
            this.addForm.pics.splice(index, 1)
        },
        /**
         * 处理图片预览效果
         * @param file
         */
        handlePreview(file) {
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        /**
         * 监听图片上传的成功的事件
         */
        handleSuccess(response) {
            // 1.拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path }
            // 2.将图片信息对象, push到 pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        /**
         * 添加商品按钮
         */
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项!')
                }
                // 执行添加的业务逻辑
                /**
                 * 级联选择器中 v-model绑定的只能是数组吗?  疑问: 老师的element-ui版本和我这个版本不一样
                 * 将数组转换为字符串
                 * @type {*}
                 */// 对addForm进行深拷贝  lodash cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // this.addForm.goods_cat = this.addForm.goods_cat.join(',')

                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)
                const { data: res } = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败!')
                }
                this.$message.success('添加商品成功!')
                // 编程式导航, 跳转页面
                await this.$router.push('/goodslist')
            })
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    // margin 上 右 下 左
    margin: 0 15px 0 0 !important;
}

.btnAdd {
    margin-top: 15px;
}

.previewImg {
    width: 100%;
}
</style>
